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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/2 = -22/x // + -22/x
5/2-(-22/x) = 0
22*x^-1+5/2 = 0
22*x^-1 = -5/2 // : 22
x^-1 = -5/44
-1 < 0
1/(x^1) = -5/44 // * x^1
1 = -5/44*x^1 // : -5/44
-44/5 = x^1
x = -44/5
x = -44/5
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